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Summer 2015 General Thunderstorm Thread


powderfreak

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1030 PM UPDATE...

BOUNDARY LAYER STABILIZING AS TEMPERATURES COOL AT THE SURFACE.
BUT THAT IS LIKELY NOT GOING TO STOP THE SHOW. AS DERIVED FROM THE
SPC MESOANALYSIS WE ARE STILL BENEATH A BROAD AREA OF LOW PRESSURE
WITH CYCLONIC FLOW ALOFT. A FAIR AMOUNT OF ELEVATED INSTABILITY AT
DISPOSAL OF AROUND 1-2K J/KG. SHEAR IS WEAK OR HARDLY PRESENT. THE
FOCUS FOR THIS EVENING INTO THE OVERNIGHT IS THE DEVELOPMENT OF
SCATTERED SHOWERS / THUNDERSTORMS WHEREVER LIFT WITHIN THE LOW- TO
MID-LEVELS ABOVE THE BOUNDARY LAYER CAN BE GENERATED. PERHAPS SOME
OROGRAPHIC LIFT AIDING TO THE CAUSE. MID-LEVEL LAPSE RATES ARE
AROUND 6C/KM SUBSEQUENTLY CONDITIONALLY UNSTABLE. THUS SOME CORES
COULD GET QUITE UP THERE WITH HEIGHT THROUGH THE ATMOSPHERE.
FREEZING LEVELS AROUND 13 KFT WITH THE -10 / -20C AT 19 AND 23 KFT
RESPECTIVELY. THE PRIMARY THREATS WITH ANY STORMS IS HEAVY RAIN
AND LOCALIZED FLOODING CONSIDERING THE LIGHT MEAN WIND FLOW
THROUGH THE LAYER. ALSO HAVE TO CONTEND WITH LIGHTNING. SOME
SECONDARY THREATS POSSIBLE OF HAIL AND GUSTY WINDS. WITH SHEAR
BEING SO WEAK...WITH ANY HAIL IT WILL BE SMALL. UPDRAFTS LIKELY
NOT TO SUSTAIN.

OTHERWISE A MILD AND SOMEWHAT MUGGY NIGHT. LOWS DOWN INTO THE 60S
AND THERE IS LIKELY TO BE SOME PATCHY FOG IN SPOTS CONSIDERING THE
ANTECEDANT RAINS OF EARLIER TODAY AND DEWPOINTS IN THE LOW- TO
MID-60S. ANYWHERE WHERE IT CAN CLEAR OUT EVER BRIEFLY WITH THE
LIGHT SURFACE WINDS MAY RESULT IN QUICK FOG DEVELOPMENT.

NEAR-TERM FORECAST GUIDANCE USED WITH THIS FORECAST BUT BLENDED
WITH SREF PROBABILITIES AND MOS GUIDANCE. IT IS ANYONES GUESS AS
TO WHERE CONVECTION WILL DEVELOP. BEST THING TO CONVEY IS THE
CHANCE AND THE POTENTIAL THREATS.

&&

.SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/...

MONDAY...

REMNANT BOUNDARY /PREVIOUS COLD FRONT WEAKENING/ DRIFTS INTO OUR
AREA FROM THE WEST ON MONDAY. LOW LEVEL SOUTHERLY FLOW WILL CONTINUE
TO KEEP MOISTURE INTO OUR AREA...WITH SURFACE DEWPOINTS IN THE MID
AND UPPER 60S...AND PWATS AROUND 1.5 INCHES. POTENTIAL FOR SURFACE-
BASED INSTABILITY TO INCREASE TO 1000-2000 J/KG FOR THE AFTERNOON.
THE INSTABILITY ACCOMPANIED BY THE REMNANT BOUNDARY WILL ALLOW
FOR SHOWER/THUNDERSTORM DEVELOPMENT. WILL WARRANT CHANCE POPS.
WITH THE MEAN WIND FLOW AROUND 10 MPH OUT OF THE W...THREATS
CONSIDERED ARE HEAVY RAIN / MARGINAL HAIL / PERHAPS STRONG TO
DAMAGING WINDS FROM PULSE-TYPE CONVECTION /WEAK SHEAR ENVIRONMENT/.

POTENTIAL LOCALIZED URBAN/POOR DRAINAGE FLOODING. WARM AND
HUMID WITH HIGHS MOSTLY IN THE 80S.

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HRRR crushes N RI up to ORH and then rolls that complex up thru Boston later in the day. Also NW CT up thru W Mass again with storms..but it misses most of CT save far NE CT.  Tomorrow's a new day

 

Eh, I wouldn't roll with every run of that model. My take, is that any subtle boundary may ignite a few storms...sometimes even terrain helps.

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Exactly what the fear was..rich getting even richer

 

poor going bankrupt

 

HIGH-RES MODELS HAVE DONE A GOOD JOB IN PINPOINTING THIS AREA AS

FAVORED LOCATION FOR CONVECTION. TREND SHOULD BE FOR THIS ACTIVITY
TO BUILD SLOWLY N WITH TIME...REACHING INTO MASS PIKE CORRIDOR BY
MIDDAY OR EARLY AFTERNOON WITH FOCUS PROBABLY ACROSS EASTERN MA AS
OPPOSED TO W NEW ENGLAND.

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Exactly what the fear was..rich getting even richer

 

poor going bankrupt

 

HIGH-RES MODELS HAVE DONE A GOOD JOB IN PINPOINTING THIS AREA AS

FAVORED LOCATION FOR CONVECTION. TREND SHOULD BE FOR THIS ACTIVITY

TO BUILD SLOWLY N WITH TIME...REACHING INTO MASS PIKE CORRIDOR BY

MIDDAY OR EARLY AFTERNOON WITH FOCUS PROBABLY ACROSS EASTERN MA AS

OPPOSED TO W NEW ENGLAND.

 

We lush and green.

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